Code: 07.07 15:48:35 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:492) 07.07 15:48:35 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459) 07.07 15:48:35 [Server] INFO at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554) 07.07 15:48:35 [Server] INFO at net.minecraft.server.World.doTick(World.java:1750) 07.07 15:48:35 [Server] INFO at net.minecraft.server.World.save(World.java:251) 07.07 15:48:35 [Server] INFO at net.minecraft.server.World.A(World.java:261) 07.07 15:48:35 [Server] INFO at net.minecraft.server.World.m(World.java:2718) 07.07 15:48:35 [Server] INFO at net.minecraft.server.WorldNBTStorage.checkSession(WorldNBTStorage.java:74) 07.07 15:48:35 [Server] INFO net.minecraft.server.WorldConlictException: Failed to check session lock, aborting 07.07 15:48:35 [Server] SEVERE Unexpected exception 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.ThreadServerApplication.run(SourceFile:492) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.World.doTick(World.java:1750) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.World.save(World.java:251) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.World.A(World.java:261) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.World.m(World.java:2718) 07.07 15:48:35 [Server] SEVERE at net.minecraft.server.WorldNBTStorage.checkSession(WorldNBTStorage.java:74) 07.07 15:48:35 [Server] SEVERE net.minecraft.server.WorldConlictException: Failed to check session lock, aborting What is this?